scientificNameID (http://rs.tdwg.org/dwc/terms/scientificNameID) @return [String] Exclusively used to reference an external and resolvable identifier that returns nomenclatural (not taxonomic) details of a name. Use taxonID to refer to taxa. Use to explicitly refer to an external nomenclatural record. Example: “urn:lsid:ipni.org:names:37829-1:1.3”